拆分器 omitEmptyStrings() 方法 |番石榴 |Java

方法omitEmptyStrings()返回一个与此拆分器等效的拆分器，但会自动从结果中省略空字符串。例如，Splitter.on (', ').omitEmptyStrings().split(“, a,,, b, c,,”) 返回一个仅包含 [“a”, “b”, “c”] 的可迭代对象。

句法：

public Splitter omitEmptyStrings()

返回值：此方法返回具有所需配置的拆分器。

Note: If either trimResults option is also specified when creating a splitter, that splitter always trims results first before checking for emptiness. So, for example,

Splitter.on(‘:’).omitEmptyStrings().trimResults().split(“: : : “)

returns an empty iterable.

下面的例子说明了 omitEmptyStrings() 方法的工作：

示例 1：

// Java code to show implementation of
// omitEmptyStrings() method
// of Guava's Splitter Class
  
import com.google.common.base.Splitter;
import java.util.List;
  
class GFG {
  
    // Driver's code
    public static void main(String[] args)
    {
  
        // Creating a string variable
        String str = "geeks,,  for,,,  geeks,, noida,,, classes";
        System.out.println("String with empty strings: \n"
                           + str);
  
        // Using omitEmptyStrings() method.
        // Two delimiters sometimes occur right next
        // to each other. This means an empty entry.
        // But often in splitting, we don't want
        // to keep empty entries.
        List myList = Splitter.on(', ').
         trimResults().omitEmptyStrings().splitToList(str);
  
        System.out.println("\nString with empty"
                           + " strings removed: \n"
                           + myList);
    }
}

输出：

String with empty strings: 
geeks,,  for,,,  geeks,, noida,,, classes

String with empty strings removed: 
[geeks, for, geeks, noida, classes]

示例 2：

// Java code to show implementation of
// omitEmptyStrings() method
// of Guava's Splitter Class
  
import com.google.common.base.Splitter;
import java.util.List;
  
class GFG {
  
    // Driver's code
    public static void main(String[] args)
    {
        // Creating a string variable
        String str = "Hello..$.$ everyone..$& $ what's up..?";
        System.out.println("String with empty strings: \n"
                           + str);
  
        // Using omitEmptyStrings() method.
        // Two delimiters sometimes occur right next
        // to each other. This means an empty entry.
        // But often in splitting, we don't want
        // to keep empty entries.
        List myList = Splitter.on('.').
            trimResults().omitEmptyStrings().splitToList(str);
  
        System.out.println("\nString with empty"
                           + " strings removed: \n"
                           + myList);
    }
}

输出：

String with empty strings: 
Hello..$.$ everyone..$& $ what's up..?

String with empty strings removed: 
[Hello, $, $ everyone, $& $ what's up, ?]